Abid Ullah

Hamburg University of Technology | TUHH · Institute of Laser and System Technologies

Despite several challenges, including the inherent brittleness of ceramics, inadequate melting of the powder, and the formation of microstructural defects, laser powder bed fusion remains a promising method for ceramic fabrication. This research looks at the intricate relationship between laser power as a dominant factor in the energy density, the...

Additive manufacturing (AM) and topology optimization (TO) emerge as vital processes in modern industries, with broad adoption driven by reduced expenses and the desire for lightweight and complex designs. However, iterative topology optimization can be inefficient and time-consuming for individual products with a large set of parameters. To addres...

The microstructure and mechanical property regime of laser powder bed fusion fabricated Al 2 O 3-ZrO 2 hyper-eutectic ceramic samples were thoroughly investigated by tailoring the printing parameters. The findings indicate that both the hypereutectic and eutectic microstructure are obtained depending on the varying printing parameters. The ZrO 2 de...

This article discusses the use of Material Extrusion of Metals (MEX/M - defined in ISO/ASTM 52900) technology for producing multi-material components, which offers a cost-effective and efficient method without requiring major adaptations to existing equipment. The article presents the successful manufacture of 316L/17–4PH multi-alloy steel cubes fo...

Under multiaxial stress states, the mechanical features and damage behaviors of biaxial glass/vinyl ester woven fabric composites with six different angle layers, including 0˚, 15˚, 30˚, 45˚, 60˚, and 75˚, are evaluated experimentally. Tensile strength, 3-point bending, short beam shear strength, and Charpy impact tests are studied to examine the i...

Book Abstract: Handbook of Post-Processing in Additive Manufacturing is a key resource on postprocessing treatments available for additive manufactured products. It provides broad coverage of the theory behind emerging technology, material development, functional characterization, and technical details required to investigate novel applications an...

Correction for ‘Vat photopolymerization-based 3D printing of polymer nanocomposites: current trends and applications’ by Mussadiq Shah et al. , RSC Adv. , 2023, 13 , 1456–1496. https://doi.org/10.1039/D2RA06522C

[This corrects the article DOI: 10.3389/fchem.2023.1034473.].

Purpose This study aims to describe the effects of capillary forces or action, viscosity, gravity and inertia via the computational fluid dynamics (CFD) analysis. The study also includes distribution of the binder droplet over the powder bed after interacting from different heights. Design/methodology/approach Additive manufacturing (AM) has revol...

The synergistic integration of nanocomposites and 3D printing has opened a gateway to the future and is soon expected to surpass its rivalry with traditional manufacturing techniques. However, there is always a challenge associated with preparing a nanocomposite resin for polymerization-based 3D printing, which is the agglomeration of nanoparticles...

Laser powder bed fusion is a laser-based additive manufacturing technique that uses a high-energy laser beam to interact directly with powder feedstock. LPBF of oxide ceramics is highly desirable for aerospace, biomedical and high-tech industries. However, the LPBF of ceramics remains a challenging area to address. In this work, a new slurry-based...

The synthesis and manufacturing of polymer nanocomposites have garnered interest in recent research and development because of their superiority compared to traditionally employed industrial materials. Specifically, polymer nanocomposites offer higher strength, stronger resistance to corrosion or erosion, adaptable production techniques, and lower...

Laser powder bed fusion (LPBF) has revolutionized many industries. In this paper, we report a new approach of LPBF for oxide ceramics with selective oxidation that reduces cracks and manufacturing defects. In this method, laser energy density was used to control the oxidation within the material article. Cuprous oxide was additively manufactured in...

Purpose- This paper aims to reduce part defects and improve ceramic additive manufacturing (AM). Selective laser melting (SLM) experiments were carried out to explore the effect of laser power and scanning speed on the microstructure, melting behaviour and surface roughness of cuprous oxide (Cu 2 O) ceramic. Design/methodology/approach- The experi...

Laser Powder Bed Fusion (LPBF) is a cutting-edge 3D printing (additive manufacturing) technology that is based on the effective interaction of a high-energy laser beam with powder feedstock. Laser additive manufacturing enables the creation of intricate polymer or metal components. A significant benefit is its ability to achieve extremely high ener...

Purpose The purpose of this paper is to eliminate Part defects and enrich additive manufacturing of ceramics. Laser powder bed fusion (L-PBF) experiments were carried to investigate the effects of laser parameters and selective oxidation of Titanium (mixed with TiO 2 ) on the microstructure, surface quality and melting state of Titania. The causes...

In this paper, the mechanical properties of hydroxyl-terminated polybotadiene (HTPB) propellant were tested at 293K in various loading conditions. The experiments were carried out by via the split Hopkinson pressure bar (SHPB) and universal testing machine. The results show that the stress is directly proportional to the strain, the stain rate was...